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A 242.2,NVENOR Feb Feb. 11, 1936. G, CAWLEY 2,030,57. WALWE OPERATING MECHANISM Filed Oct. 20, 1931 2 Sheets-Sheet 1 22- 7. 2.3 % ^. 7a a 4 12. 2a- 2. a 37 26 72? 22 2. ' 2 2a s sa a. 27 72 2- 72 2 2. 6. 4. 3. 22 7 a co 2 a - rs - 31 a 27-\ah 26 aa - W. - | c 2..." | Yesw - - - - f is 152.-- SA flat GS 2. 2 72 Y 2 a? a 242.2,NVENOR Feb. 11, 1936. G, CAWLEY 2,030,571 WALWE OPERATING MECHANISM Filled Oct. 20, 193l 2 Sheets-Sheet 2 aaaaaaaaaaaaa. f awararawayawawarar AORNEYs Patented Feb. 11, 1936 2,030,571. UNITED STATES PATENT OFFICE 2,030,571 WALWE OPERATING MECHANISM George Cawley, Upper Montclair, N. J. Application October 20, 1931, Serial No. 569,886 8 Claims, (C. 121-163) This invention relates to a novel and improved 5, and 6 I have indicated how the invention could valve operating mechanism, the novel features of be applied to the operation of one of the valves, Which Will be best understood from the following namely, the inlet valve at the head end of the description and the annexed drawings, in which Cylinder, that is to say, the end opposite the I have shown selected embodiments of the in Crank end. For the sake of simplicity, I have vention, and in which: not shown in Fig. 1 the means for operating Fig. 1 is a perspective view of one form of the the Valves at the other or head end of the cyl invention. inder, since the addition of such means to the Fig. 2 is a perspective view of part of the ap arrangement shown in Fig. 1 will be obvious to paratus appearing in Fig. 1, but showing a dif those skilled in the art. Since in Figs. 3, 4, 5, 10 ferent form of control therefor. and 6 I have shown an inlet valve, I shall refer Figs. 3, 4, 5, and 6, are diagrams illustrating to that valve by the same number as the inlet the operation of the invention with a slightly dif Valve of Fig. 1, and shall identify the cams and ferent embodiment. other operating parts therefor by the same num ls My invention relates to means for accurately bers. s Operating valves, particularly of the poppet type, The inlet valve is designated ?o, and its stem which move to and from a seat, especially when has a sliding fit in an opening in the casing Such valves are used in situations. Where they 2. Steam may pass through the steam-chest Should operate in synchronism with a plurality of 3 into the cylinder, between the valve O and its 20 different moving parts of a mechanism. For the seat 4, the valve being guided by its stem in 20 Sake of illustration, I have shown the invention a rectilinear movement to and from its seat. as applied to a reciprocating steam engine, such The outlet valve likewise connects the steam as used in locomotives, although it is to be un chests with the cylinder, although the valve it derstood that the invention may be employed Self and its seat are not illustrated, the stem 5 25 With other mechanisms when found applicable. thereof, however, appearing in Fig. 1. For the 25 Referring to the drawings, the numeral f des purpose of understanding my invention, further ignates a cylinder of a reciprocating steam en illustration of the outlet valve is not needed, it gine which, for the sake of illustration, has been being understood that its construction and op Selected as an engine With Which the invention eration are similar to that of the inlet valve. 30 is used. Within the cylinder reciprocates a pis The numeral f6 designates any fixed part of 30 ton 2 having a stem 3 extending through the the engine Supporting a pivot 7 upon which is head of the cylinder, and connected to a cross rockably mounted a link 8 having a curved slot head 4 sliding on Suitable guides 5. Connected 9 therein in which slides a block 20. The link to the cross-head is the connecting rod 6 which, is rocked by the links 2 and 22 which connect 35 in turn, is connected by the pin 7 to the crank 8 it to the crank pin T and is used to aid in control 35 Secured to the driving Shaft 9. ling the operation of the inlet and outlet valves, Reciprocation of the piston is caused by steam the link 22 being the return crank. The block or other fluid which is caused to enter the cyl 20 may be slid in the slot 9 as by a bell crank inder and to be exhausted therefrom. The inlet lever 23 pivoted at 24 upon the frame of the en 40 and exhaust are controlled by valves as well gine and having a link 25 connected to one arm. 40 known in the art, and it is with the operating thereof and pivoted to an arm 26 in turn piv mechanism for these valves that my invention oted to the block 20. This movement of the block finds particular utility. For the sake of sim 20 in the slot 9 is used for reversing the en plicity, I have indicated the valve as being of gine. The position of the parts shown in Fig. 1 45 the single disk type, although it is to be under Will produce clockwise rotation of the crank pin 45 stood that the invention may be used With any 7. This may be a reverse motion with some types form of valve, so long as it is of the type gen of engine and a forward motion with others. erally known as a “poppet valve'; that is to The Operation of the valves is controlled from Say, One Which moves to and from a positive seat the movement of the piston and also from the 50 Or SeatS. movement of the return crank, and, according to 50 As noted above, the usual valves are employed my invention, I combine these two movements With the cylinder and piston, and in Fig. 1, I into one in Such a way as to cause a rectilinear have shown the invention as applied to the movement of the valves to and from their seats. operation of the inlet and exhaust valves at the The movement from the piston is obtained 55 crank end of the cylinder, whereas in Figs, 3, 4, through a link 27 pivoted at one end to the cross 55 2 - 2,030,571. head 4 and at the other end to an arm 28 fast upon of the slot 9 of the link 8 to place the valves a cam shaft 29 to which are secured cams 30 and in correct position for opposite operation of the 3. The movement from the return crank is engine. The position of the cam 3) with respect caused by rocking of the link 8 and consequent to the cam 35 may be accurately adjusted to get movement of the block 20 which is transmitted the desired action of the valve 0, particularly for to the camshaft 32 by means of the link 33 form varying the cut-off, and in Fig. 1 I have indicated ing an extension of the arm 26 and pivoted at the One means by which this may be accomplished. other end to an arm 34 secured on the cam shaft This means comprises a hub 45 secured to the 32, which can shaft carries the cams 35 and 36. cam 30 and mounted upon a spiral tongue 46 0 The stem if of the valve O is pivotally secured Secured on the can shaft 29. The hub may be 0. at 37 to a cam follower 38 in the form of a rocker slid on the shaft by means of a fork 47 pivoted carrying at its opposite ends rollers 39 and 40 at 48 upon the frame of the engine and having which ride upon the cams 30 and 35, respectively. a handle 49 for operation thereof. Similarly, the outlet valve stem 5 is pivotally While the ever 23 and fork 4 have been shown connected at 4 to a can follower 42 provided as being provided with short handles for opera 15 With rollers 43 and 44 bearing upon the surfaces tion, it is of course to be understood that where of the cams 3 and 38, respectively. the invention is used on a locomotive, for instance, From the above arrangement, it will be seen these handles will be replaced by Suitable connec that upon operation of the engine, movement of tions extending to some position handy for the the cross-head 4 and the return crank 22, one of operator. 20 which has a reciprocating motion and the other Usually, the movement of the piston or cross a continuous rotary motion, will be combined head and the movement of the crank are in phase in the movement of the valve stems if and 5' with each other, whereas the piston and the re and, consequently, of the valves secured thereto. turn crank are out of phase with each other. For 2 5 Movement of the cross-head 4 causes rocking or example, the cross-head will move in phase With 25 reciprocating of the can shaft 29, and movement the piston, whereas the return crank 22 is 90 or of the return crank 22 causes rocking of the link 270° out of phase with the piston.
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